You couldn't believe this! Brooklyn Mariner, your girlfriend of almost three years is some kind of... fish? How on earth could you not have noticed? Brooklyn lays splayed out on the rock, her heavy breathing getting slower. Soon, you couldn't quite see what was going on, so you very slowly and quietly swim closer. The moon isn't enough to see everything, but she was moving about. Her hands... seemed to be...
It soon dawned on you at the same time as a moan was heard escaping her lips. She was masturbating! Your cheeks heat up, but your blushing soon disappears as surprise is replaced by arousal. As Brooklyn moans, her voice sounds almost... melodic, as if she were singing. It's beautiful... Your hand soon trails down under the water and over your stiff member, and as your fishy girlfriend continues indulging in herself, you start doing the same. At the same time, you quietly get out of the water, and creep up onto the shore, behind another rock close by. Soon her melody grows louder and more passionate. And as you jerk off to the siren song, you feel yourself reaching your peak. She moans a final note as the rock is coated with juices coming from her wet, slippery and slightly scaly folds. As she cums, you ejaculate all over the rock and the sand in front of you, letting out a quiet breath.
Recovered from your orgasm, you peak over the rock, and spot Brooklyn panting and giggling. She stands up from the rock and begins walking back to the waves. You watched as she with elegant webbed feet, almost prances back into the water, diving in. You see the pink dorsal fin shooting off towards deeper waters, and it soon disappears beneath the waves. "Holy shit...!" You whispered to yourself. You grab your clothes, putting them on quickly before sprinting back to your house. As you close the front door, you sit down, stilling your nerves with a drink from the bar. You need to gather your thoughts... somehow.